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Posted to dev@lucene.apache.org by "Adrien Grand (JIRA)" <ji...@apache.org> on 2016/07/12 12:45:20 UTC

[jira] [Resolved] (LUCENE-7347) Remove queryNorm and coords

     [ https://issues.apache.org/jira/browse/LUCENE-7347?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Adrien Grand resolved LUCENE-7347.
----------------------------------
       Resolution: Fixed
    Fix Version/s: master (7.0)

Both queryNorm and coords are now gone in master:
 - disjunctions just sum up the scores of their matching sub queries, 
 - boosts are applied as multiplicative factors to the scores.

> Remove queryNorm and coords
> ---------------------------
>
>                 Key: LUCENE-7347
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7347
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Adrien Grand
>            Assignee: Adrien Grand
>             Fix For: master (7.0)
>
>
> These two features are specific to TF-IDF and introduce some complexity (see eg. handling of coords in BooleanWeight) and bugs/corner-cases (see eg. how taking the query norm into account causes scoring challenges on LUCENE-7337).
> Since we made BM25 the default in 6.0, I propose that we remove these TF-IDF-specific features in 7.0.



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